Hi, I think of cleaning the fans is pretty good, I also have an HP with i7 and goes very fast, it is also true that quite heated but this is normal, do not worry because the processor can operate at very high temperatures . I guess that will have 4GB of RAM so do not think that's a problem. What format the Win is a mistake, does not have to be Win, we are always giving judgments, and Win7 is going well, you have to see it is that this running at all times and why stops. You have adequate antivirus? it is likely that most of the power is going into sub're not using. I7 goes a long way.